A reactive voltage collaborative control system consisting of DSTATCOM and micro-grid is proposed. In this system, small-capacity DSTATCOM as a continuous subsystem for rapid continuous reactive power regulation and micro-grid as discrete subsystem to provide large-capacity graded reactive power. Rapid adjustment of reactive power is realized by their collaborative work. Simulation shows that combined running system could effectively suppress voltage fluctuation. Power supply quality is further improved and original power devices capacity is decreased. At the same time, micro-grid reactive power can be real time scheduled. Micro-grid takes responsibility to regulate power quality, not only provide power supply. It could be more easily accepted by distribution network.